Balanced slide-valve



(No Mbdel.)

- E. RUUD.

BALANCED SLIDE VALVIL Patented July 4, 1882.

' UNITE STATES PATENT O FICE.

EDWIN RUUD, F ALTOONA, PENNSYLVANIA.

VBALANCED'SLIDE-V'ALVE.

SPECIFICATION forming part of Letters Patent No. 260,612, dated July 4, 1882.

Application filed November 12, 1881 (No model.)

the heavy pressure on the bucket the slidevalve, which large friction is a great loss for every steam-engine.

Figure 1 is a vertical section of the apparatus, and also the slide-valve and steamchest. Fig.2 is a top view of apparatus. Fig.

3 is a side view of the same, and Fig. 4 is a vertical section of the valve.

Similar letters refer to similar parts throughout the several views. 7

A a. is one cylinder, but with different diameters, and the small end consists of a valve, 0.

B is a hole in the cylinders passage from the valve and downward.

O are small holes, which open into'the larger hole, 13. A

E is a groove in the sleeve. D is also a groove, and F is a hole for letting the pressure on the back side of the balancing slidevalve out to the air.

G is a hole which continues from B.

H is a screw for tightening or loosening the spring I.

K is a pipe supplied with steam from the boiler or from L. The steam comes to the cylinder from L. The idea is to get a pressure in the steam-chest just large enough to keep the slide-val ve down. Therefore the area of the large end of the cylinder A is in proportion to the area of the small end a-or valve 0 as the area of the slide N is in proportion to the area of the steam-ports L-l-L.

The operation is as follows: The steam enters at K, passes down through the valve 0, fills the groove F, and enters the holes 0, and

- then to the larger hole, B, and passes down to the steam-chest M. As soon as the pressure on the area of the large end of the cylinder becomes greater than the pressure on the valve 0 the valve will be pressed up to its seat, and no steam will be let through. By the spring I and the screw H the pressure in the steamchest can be regulated some few pounds. By

.the steam-gage P the pressure in the steamchestcan be indicated, so that the right pressure may be kept in the steam-chest.

What I claim, and desire to secure by Let- I ters Patent of the United States, is-

1. A slide-valve, in combination with the valve-cylinder A, for regulating the pressure on the back of said valve, said cylinder being.

provided with apassage through it and a valve, 0, at the small end of said cylinder, the area of the large end of cylinder A being in the same proportion to the small end of the cylinder as the area of said slide-valve is in proportion to that of the ports which it covers and moves, substantially as set forth.

2. The combination, with the valve-cylinder A. having its smaller end, a, provided with a valve, 0, and a passage, B, in said cylinder, of the grooves D E, passage F, and steam-chest M, having slide N and ports L, substantially as set forth.

3. The combination, with a valve-cylinder of different diameters, asstated, the small end thereof comprising. a valve, 0, and provided with a passage, B, and holes 0 opening into a valve and passage, substantially as set forth.

5. Screw-threaded rod H and its nut, in combination with spring I, valve 0, regulating-cylinder A. having passage B, and the slide-valve, substantially as set forth.

EDWIN BUUD.

Witnesses J NO.:S. OUsTER, CHARLES LINDs'rRtJ'M. 

